• Arctic SDI catalogue
  •  
  •  
  •  

Biodiversity of the American lobster trawl survey in the Magdalen Islands

A research survey on American lobster (Homarus americanus) has been conducted annually in the Magdalen Islands since 1995 to assess the abundance and structure of lobster populations in this area. Starting in 2007, the main objective was modified to include the diversity and abundance of benthic species associated with lobster habitat. Only benthic species data associated with lobster habitat are presented in this dataset.

Surveys were generally conducted during the first two weeks of September from 2007 to 2020 on the entire south side of the Magdalen Islands, from Grosse-Île to Havre-Aubert. The sampling plan consists of 70 trawl tows on 50 fixed stations, between 4 and 35 meters in depth. Some stations had double tows. Specimens were collected using a Nephrops-type door trawl with a total width of 3.04 meters consisting of four Vexar™ lined baskets of 19 millimeter mesh size in order to harvest small individuals. Start and end positions were recorded to calculate the distance traveled at each tow using the geosphere library in R. The year 2011 is not included in the dataset, as biodiversity data were not recorded. Since 2017, the average tow distance has been reduced from 1000 meters to 500 meters. The opening of the trawl is also noted every minute throughout the duration of the tow so that the area sampled can be calculated. The area covered in each tow was the product of the trawl opening and the distance traveled.

The two files provided (DarwinCore format) are complementary and are linked by the "eventID" key. The "Event_data" file includes generic activity information, including date and location. The "Occurrence" file includes the taxonomy of the observed species, identified to the species or lowest possible taxonomic level. For abundance and biomass estimates, contact Benoît Bruneau (Benoit.Bruneau@dfo-mpo.gc.ca ).

For quality controls, all taxonomic names were checked against the World Register of Marine Species (WoRMS) to match recognized standards. The WoRMS match was placed in the "ScientificnameID" field of the occurrence file. Special cases were noted in the "identificationRemarks" field and selected specimens were confirmed with field photos mentioned in "associatedMedia". Data quality checks were performed using the R obistools and WORMS libraries. All sampling locations were spatially validated.

Simple

Date ( RI_367 )
2021-10-28
Date ( RI_366 )
2021-10-28
RI_418
  Government of Canada;Fisheries and Oceans Canada;Sciences/Demersal and Benthic Sciences Branch (DBSB) - Benoît Bruneau ( Aquatic science biologist )
Maurice Lamontagne Institute, 850, route de la Mer , Mont-Joli , Quebec , G5H 3Z4 , Canada
RI_414
  Government of Canada;Fisheries and Oceans Canada;Sciences/Demersal and Benthic Sciences Branch (DBSB) - Nathalie Paille ( Biological science technician )
Maurice Lamontagne Institute, 850, route de la Mer , Mont-Joli , Quebec , G5H 3Z4 , Canada
Status
onGoing; enContinue RI_596
Maintenance and update frequency
asNeeded; auBesoin RI_540
Keywords ( RI_530 )
  • Occurrence, Sampling, Biodiversity, Trawl, Lobster
Keywords ( RI_525 )
  • Magdalen Islands, Grosse-Île, Havre-Aubert, Gulf of St. Lawrence
Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
  • Aquatic wildlife
  • Aquatic ecosystems
Classification
unclassified; nonClassifié RI_484
Use limitation
Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
Access constraints
license; licence RI_606
Use constraints
license; licence RI_606
Spatial representation type
grid; grille RI_636
Metadata language
eng; CAN
Metadata language
fre; CAN
Character set
utf8; utf8 RI_458
Topic category
  • Biota
  • Environment
Begin date
2007-09-06
End date
2020-09-13
N
S
E
W
thumbnail


Reference system identifier
https://epsg.io / EPSG:4326 /
Distribution format
  • CSV ( 16.0.5149.1000 )

RI_414
  Government of Canada;Fisheries and Oceans Canada;Sciences/SAISB - Section Gestion de données - Direction des avis, information et soutien scientifiques / Data Management Section - Scientific Advice, Information and Support Branch ( Biologist )
Maurice Lamontagne Institute, 850, route de la Mer , Mont-Joli , Quebec , G5H 3Z4 , Canada
OnLine resource
Event data ( HTTPS )

Dataset;CSV;eng

OnLine resource
Event data ( HTTPS )

Dataset;CSV;fra

OnLine resource
Occurrence data ( HTTPS )

Dataset;CSV;eng

OnLine resource
Occurrence data ( HTTPS )

Dataset;CSV;fra

OnLine resource
Biodiversity of the American lobster trawl survey in the Magdalen Islands ( ESRI REST: Map Service )

Web Service;ESRI REST;eng

OnLine resource
Biodiversity of the American lobster trawl survey in the Magdalen Islands ( ESRI REST: Map Service )

Web Service;ESRI REST;fra

OnLine resource
Data dictionary ( HTTPS )

Supporting Document;CSV;eng,fra

File identifier
99cb7034-f3d5-4da4-a5bc-e81315cfb8eb XML
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Hierarchy level
dataset; jeuDonnées RI_622
Date stamp
2025-02-06T00:52:42.19Z
Metadata standard name
North American Profile of ISO 19115:2003 - Geographic information - Metadata
Metadata standard version
CAN/CGSB-171.100-2009
RI_420
  Government of Canada;Fisheries and Oceans Canada;Sciences/Demersal and Benthic Sciences Branch (DBSB) - Claude Nozères ( Biologist )
Maurice Lamontagne Institute, 850, route de la Mer , Mont-Joli , Quebec , G5H 3Z4 , Canada
 
 

Overviews

overview
lobster_thumbnail.png
overview
Map of station

Spatial extent

N
S
E
W
thumbnail


Keywords


Provided by

logo

Associated resources

Not available


  •  
  •  
  •